1、BSI Standards PublicationBS ISO 6624-2:2016Internal combustion engines Piston ringsPart 2: Half keystone rings made of castironBS ISO 6624-2:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 6624-2:2016. It supersedes BS ISO 6624-2:2003 which is withdrawn.Th
2、e UK participation in its preparation was entrusted to Technical Committee MCE/14/-/10, RIC engines - Cylinders, pistons and rings.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisio
3、ns of a contract. Users are responsible for its correct application. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 74656 7 ICS 43.060.10 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published
4、 under the authority of the Standards Policy and Strategy Committee on 29 February 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 6624-2:2016 ISO 2016Internal combustion engines Piston rings Part 2: Half keystone rings made of cast ironMoteurs combustion intern
5、e Segments de piston Partie 2: Segments demi-trapzodaux fabriqus en fonte mouleINTERNATIONAL STANDARDISO6624-2Second edition2016-02-15Reference numberISO 6624-2:2016(E)BS ISO 6624-2:2016ISO 6624-2:2016(E)ii ISO 2016 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in SwitzerlandAl
6、l rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested f
7、rom either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 6624-2:2016ISO 6624-2:2016(E)Foreword ivIntroduction v1
8、 Scope . 12 Normative references 13 Overview . 14 Ring types and designation examples 14.1 Type HK Straight faced half keystone ring 7 14.1.1 General features 14.1.2 Designation . 24.2 Type HKB Barrel faced half keystone ring 7 24.2.1 General features 24.2.2 Designation . 44.3 Type HKBA Asymmetrical
9、 barrel faced half keystone ring 7( h1 1,2 mm) . 44.3.1 General features 44.3.2 Designation . 55 Common features . 55.1 Type HK, HKB and HKBA Half keystone ring . 55.1.1 Uncoated rings . 55.1.2 Chromium plated or spray coated rings 65.2 Chamfered edges Type HK, HKB and HKBA rings Outside and/or insi
10、de chamfered edges (KA, KI) 75.3 Type HK, HKB and HKBA rings (fully faced, semi-inlaid) Plating/coatin g thickness . 76 Force factors 87 Dimensions and forces . 8Annex A (normative) Calculation of measurement width h3of half keystone rings .17Bibliography .18 ISO 2016 All rights reserved iiiContents
11、 PageBS ISO 6624-2:2016ISO 6624-2:2016(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member bo
12、dy interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrot
13、echnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of IS
14、O documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held re
15、sponsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is information gi
16、ven for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the followi
17、ng URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 34, Propulsion, powertrain and powertrain fluids.This second edition cancels and replaces the first edition (ISO 6624-2:2003), which has been technically revised.ISO 6
18、624 consists of the following parts, under the general title Internal combustion engines Piston rings: Part 1: Keystone rings made of cast iron Part 2: Half keystone rings made of cast iron Part 3: Keystone rings made of steel Part 4: Half keystone rings made of steeliv ISO 2016 All rights reservedB
19、S ISO 6624-2:2016ISO 6624-2:2016(E)IntroductionISO 6624 is one of a number of series of International Standards dealing with piston rings for reciprocating internal combustion engines. Others are ISO 6621,2345ISO 6622,67ISO 6623,8ISO 6625,9ISO 6626,101112and ISO 6627.13 ISO 2016 All rights reserved
20、vBS ISO 6624-2:2016BS ISO 6624-2:2016Internal combustion engines Piston rings Part 2: Half keystone rings made of cast iron1 ScopeThis part of ISO 6624 specifies the essential dimensional features of half keystone rings made of cast iron, types HK, HKB and HKBA, having nominal diameters from 38 mm u
21、p to, and including, 160 mm, used in reciprocating internal combustion piston engines for road vehicles and other applications.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated referenc
22、es, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 6621-4, Internal combustion engines Piston rings Part 4: General specifications3 OverviewThe half keystone ring types are specified in Tables 1 and 2 and F
23、igures 1 to 3. Their common features and the dimensions of those features are specified in Tables 3 and 4 and Figures 4 to 9. Tables 5 and 6 give the force factors for the different ring types, while Table 7 gives the dimensions and forces of half keystone rings.The common features and dimensional t
24、ables presented in this part of ISO 6624 constitute a broad range of variables and, in selecting a particular ring type, the designer shall bear in mind the conditions under which it will be required to operate.It is also essential that the designer refer to the specifications and requirements of IS
25、O 6621-34and ISO 6621-4 before completing selection.4 Ring types and designation examplesNOTE For the angle of half keystone rings, the same definition and measurement apply as for keystone rings (see ISO 6621-2).4.1 Type HK Straight faced half keystone ring 74.1.1 General featuresFigure 1 shows the
26、 general features of piston ring type HK.See Table 7 for dimensions and forces.h3values are calculated based on Annex A.INTERNATIONAL STANDARD ISO 6624-2:2016(E) ISO 2016 All rights reserved 1BS ISO 6624-2:2016ISO 6624-2:2016(E)12abKey1 reference plane (ring is positioned flat against datum A)2 top
27、side identification markaNominal.bt = 0,006 h1.Figure 1 Type HK4.1.2 DesignationEXAMPLE Designation of a piston ring complying with the requirements of ISO 6624-2, being a 7 half keystone ring made of cast iron, with a straight-faced peripheral surface (HK), of d1= 90 mm (90), of nominal ring width
28、h1= 1,5 mm (1,5), made of heat treated martensitic spheroidal graphite cast iron, subclass 53 (MC53), and having a chromium plated peripheral surface with a minimum thickness 0,1 mm (CR2). Parameters in parenthesis are used in the ISO ring designation:Piston ring ISO 6624-2 HK - 90 1,5 - MC53/CR24.2
29、 Type HKB Barrel faced half keystone ring 74.2.1 General featuresFigure 2 shows the general features of piston ring type HKB.See Table 7 for dimensions and forces.h3values are calculated based on Annex A.2 ISO 2016 All rights reservedBS ISO 6624-2:2016ISO 6624-2:2016(E)12aKey1 reference plane (ring
30、is positioned flat against datum A)2 top side identification markaNominal.Figure 2 Type HKBTable 1 Symmetrical barrel dimensions and gauge width (h8)Dimensions in millimetresh1h25h26h26tol. h27t2, t3h8a1,2 0,30 0,60 0,20 0,90 0,002.0,012 0,601,5 0,35 0,75 0,25 1,150,003.0,0150,801,75 0,35 0,85 0,30
31、1,35 1,002,0 0,40 1,00 0,30 1,60 1,202,5 0,45 1,25 0,40 2,05 1,603,0 0,50 1,50 0,50 2,500,005.0,0202,003,5 0,55 1,75 0,50 2,95 2,40aGauge width (h8) only informative; may be used only if agreed between the manufacturer and the customer. ISO 2016 All rights reserved 3BS ISO 6624-2:2016ISO 6624-2:2016
32、(E)4.2.2 DesignationEXAMPLE Designation of a piston ring complying with the requirements of ISO 6624-2, being a 7 half keystone ring made of cast iron, with a barrel faced peripheral surface (HKB), of d1= 90 mm (90), of nominal ring width h1= 1,5 mm (1,5), made of non-heat-treated grey cast iron, su
33、bclass 12 (MC12), and having a chromium plated peripheral surface with a minimum thickness of 0,1 mm (CR2). Parameters in parenthesis are used in the ISO ring designation:Piston ring ISO 6624-2 HKB - 90 1,5 - MC12/CR24.3 Type HKBA Asymmetrical barrel faced half keystone ring 7(h1 1,2 mm)4.3.1 Genera
34、l featuresSee Table 7 for dimensions and forces.h3values are calculated based on Annex A.a12Key1 reference plane (ring is positioned flat against datum A)2 top side identification markaNominal.Figure 3 Type HKBA4 ISO 2016 All rights reservedBS ISO 6624-2:2016ISO 6624-2:2016(E)Table 2 Asymmetrical ba
35、rrel dimensionsDimensions in millimetresh1h25ah26h26tol. h27t2bt3b1,2 0,28 0,430,150,90 00,005 0,0050,0161,5 0,35 0,50 1,15 0.0,006 0,007.0,0221,75 0,35 0,550,201,350.0,0070,008.0,0252,0 0,40 0,60 1,50 0,009.0,0302,5 0,45 0,700,251,800.0,0080,011.0,0353,0 0,55 0,80 2,10 0,012.0,0383,5 0,60 0,90 0,30
36、 2,40 0.0,009 0,012.0,040ah25may be lowered for rings with reduced edge dimensions.bt2and/or t3may be varied as agreed between the manufacturer and the customer.4.3.2 DesignationEXAMPLE Designation of a piston ring complying with the requirements of ISO 6624-2, being a 7 half keystone ring made of c
37、ast iron, with an asymmetrical barrel faced peripheral surface (HKBA), of d1= 90 mm (90), of nominal ring width h1= 1,5 mm (1,5), made of non-heat-treated grey cast iron, subclass 12 (MC12), and having a chromium plated peripheral surface with a minimum thickness of 0,1 mm (CR2). Parameters in paren
38、thesis are used in the ISO ring designation:Piston ring ISO 6624-2 HKBA - 90 1,5 - MC12/CR25 Common features5.1 Type HK, HKB and HKBA Half keystone ring5.1.1 Uncoated rings1 1a) Type HK b) Type HKB c) Type HKBAKey1 top side identification markFigure 4 Uncoated rings ISO 2016 All rights reserved 5BS
39、ISO 6624-2:2016ISO 6624-2:2016(E)5.1.2 Chromium plated or spray coated rings5.1.2.1 Fully faced1 1 1a) Type HK b) Type HKB c) Type HKBAKey1 top side identification markFigure 5 Fully faced rings5.1.2.2 Semi-inlaid1 1 1a) Type HK b) Type HKB c) Type HKBAKey1 top side identification markFigure 6 Semi-
40、inlaid rings5.1.2.3 Inlaid (not recommended for chromium plated rings)1 1 1a) Type HK b) Type HKB c) Type HKBAKey1 top side identification markFigure 7 Inlaid rings6 ISO 2016 All rights reservedBS ISO 6624-2:2016ISO 6624-2:2016(E)5.2 Chamfered edges Type HK, HKB and HKBA rings Outside and/or inside
41、chamfered edges (KA, KI)a) HK rings b) HKB rings c) HKBA ringsd) Chamfered edgesKey1 top side identification markFigure 8 Details of chamfered edges (KA, KI)Table 3 KA and KI dimensionsDimensions in millimetresd1KA KI38 d1 50 0,2 max. 0,2 max.50 d1 125 0,3 0,1 0,3 0,15125 d1 160 0,4 0,1 0,4 0,155.3
42、Type HK, HKB and HKBA rings (fully faced, semi-inlaid) Plating/coating thicknessa) Fully faced b) Semi-inlaid c) InlaidFigure 9 Plating/coating thickness ISO 2016 All rights reserved 7BS ISO 6624-2:2016ISO 6624-2:2016(E)Table 4 Plating/coating thicknessDimensions in millimetresChromium platingcodeSp
43、ray coatingcodeThicknessmin.CRF 0,005CR1 SC1 0,05CR2 SC2 0,10CR3aSC3a0,15CR4aSC4a0,20aNot recommended for rings h1 1,5.6 Force factorsThe tangential and diametral forces given in Table 7 shall be corrected when additional features or materials other than grey cast iron with a modulus of elasticity,
44、En, of 100 GN/m2, or both, are used.For common features, multiplier correction factors given in Tables 5 and 6 and the force correction factors specified in ISO 6621-4 shall be used.Table 5 Force correction factors for HK, HKB and HKBA rings with features KA or KIFactorKA KI0,98 0,98Table 6 Force co
45、rrection factors for chromium plated and spray coated HK, HKB and HKBA rings (fully faced, semi-inlaid and inlaid type)d1mmFactorCRF CR1 CR2/SC1 CR3/SC2 CR4/SC3 SC438 d1 50 1 0,81 0,70 0,64 50 d1 75 1 0,90 0,85 0,81 0,75 0,7175 d1 100 1 0,92 0,88 0,85 0,81 0,77100 d1 125 1 0,94 0,91 0,88 0,86 0,8312
46、5 d1 160 1 0,95 0,92 0,90 0,88 0,857 Dimensions and forcesSee Table 7.8 ISO 2016 All rights reservedBS ISO 6624-2:2016ISO 6624-2:2016(E)Table 7 Dimensions and forces of HK, HKB and HKBA half keystone ringsNominal diameterRadial wall thicknessNominal value of ring widthMethod AMethod Bd1a1 h1a6a7Meas
47、ured value, h3a bh3(ref.)MeasuredvaluebColumnRef.For h1shown in columnColumna6Tolerance1 2345 12345Tolerance 12345Tolerance38 1,60,15Within a ring:0,15 max.1,20,60,5 max.1,16900,024For phos -phatedPO surface:0,010,0241,160,6900,19For phos -phated PO surface:0,080,1939 1,6540 1,650,81,143 1,13 0,9041
48、 1,742 1,7543 1,844 1,8545 1,946 1,947 1,9548 249 2,0550 2,11,51,01,1181,418 1,11 1,41 1,1051 2,1552 2,1553 2,254 2,2555 2,356 2,3557 2,458 2,459 2,4560 2,50,6 max.1,1161,416 1,10 1,40 1,0961 2,5562 2,663 2,6564 2,6565 2,766 2,7567 2,868 2,8569 2,970 2,91,75 2,01,50,7 max.1,0531,353 1,6031,853 1,04
49、1,34 1,59 1,84 1,6071 2,9572 373 3,05-+-+-Dimensions in millimetres ISO 2016 All rights reserved 9BS ISO 6624-2:2016ISO 6624-2:2016(E)Table 7 (continued)Closed gapTangential forceDiametral forceNominal diameterd1FtNFdNs1ToleranceFor h1shown in columnToleranceFor h1shown in columnTolerance12345123450,150,2030 % ifFt10 N20 % ifFt10N7,330 % ifF
